feat(notifications): add multi-channel notification module with Email, FCM, templates, and event listeners

- Domain: NotificationLog/NotificationPreference entities, repositories, channel value object
- Infrastructure: EmailService (nodemailer/SMTP), FcmService (firebase-admin), TemplateService (Handlebars)
- Application: SendNotification CQRS command, UserRegistered + AgentVerified event listeners
- Presentation: NotificationsController with history, preferences, and templates endpoints
- Prisma: NotificationLog and NotificationPreference models with proper indexes
- Templates: Vietnamese notification templates for user.registered, agent.verified, listing.approved, inquiry.received, password.reset

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/components/auth/oauth-buttons.tsx

@@ -0,0 +1,54 @@
+'use client';
+
+import { Button } from '@/components/ui/button';
+
+const API_BASE_URL = process.env['NEXT_PUBLIC_API_URL'] || 'http://localhost:3001';
+
+export function OAuthButtons() {
+  return (
+    <div className="grid grid-cols-2 gap-3">
+      <Button
+        variant="outline"
+        type="button"
+        onClick={() => {
+          window.location.href = `${API_BASE_URL}/auth/google`;
+        }}
+      >
+        <svg className="mr-2 h-4 w-4" viewBox="0 0 24 24">
+          <path
+            d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92a5.06 5.06 0 0 1-2.2 3.32v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.1z"
+            fill="#4285F4"
+          />
+          <path
+            d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z"
+            fill="#34A853"
+          />
+          <path
+            d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z"
+            fill="#FBBC05"
+          />
+          <path
+            d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z"
+            fill="#EA4335"
+          />
+        </svg>
+        Google
+      </Button>
+      <Button
+        variant="outline"
+        type="button"
+        onClick={() => {
+          window.location.href = `${API_BASE_URL}/auth/zalo`;
+        }}
+      >
+        <svg className="mr-2 h-4 w-4" viewBox="0 0 24 24" fill="none">
+          <rect width="24" height="24" rx="4" fill="#0068FF" />
+          <text x="4" y="17" fontFamily="Arial" fontSize="12" fontWeight="bold" fill="white">
+            Z
+          </text>
+        </svg>
+        Zalo
+      </Button>
+    </div>
+  );
+}